I'm a big fan of mains with no ports, full range for large rooms,
or, smaller mains with no ports, with stereo pair of front facing directional subs (self powered) for smaller rooms.
Bass is not mono as some believe, just listen to the placement of bass players in jazz groups, or listen to this!
https://www.amazon.com/Double-Bass-Niels-Henning-rsted-Pedersen/dp/B00000G62F/ref=asc_df_B00000G62F/?tag=hyprod-20&linkCode=df0&hvadid=312683822382&hvpos=1o1&hvnetw=g&hvrand=3655329634212047699&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9003511&hvtargid=pla-540093611693&psc=1&tag=&ref=&adgrpid=65958438881&hvpone=&hvptwo=&hvadid=312683822382&hvpos=1o1&hvnetw=g&hvrand=3655329634212047699&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9003511&hvtargid=pla-540093611693
IF ports, front facing.
Home theater, single self powered sub can be quite successful, but, if watching music concerts, then directional 2 channel full frequency mains or pair of stereo subs is advantageous .
or, smaller mains with no ports, with stereo pair of front facing directional subs (self powered) for smaller rooms.
Bass is not mono as some believe, just listen to the placement of bass players in jazz groups, or listen to this!
https://www.amazon.com/Double-Bass-Niels-Henning-rsted-Pedersen/dp/B00000G62F/ref=asc_df_B00000G62F/?tag=hyprod-20&linkCode=df0&hvadid=312683822382&hvpos=1o1&hvnetw=g&hvrand=3655329634212047699&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9003511&hvtargid=pla-540093611693&psc=1&tag=&ref=&adgrpid=65958438881&hvpone=&hvptwo=&hvadid=312683822382&hvpos=1o1&hvnetw=g&hvrand=3655329634212047699&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9003511&hvtargid=pla-540093611693
IF ports, front facing.
Home theater, single self powered sub can be quite successful, but, if watching music concerts, then directional 2 channel full frequency mains or pair of stereo subs is advantageous .